w = [0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,-0.1,-0.2,-0.3,-0.4,0.0]
w = np.array(w).reshape([13, 1])
b = -0.2 
# 取出第1条样本数据
x1=x[0]
t = np.dot(x1, w)
z = t + b
